基于移栽期的气候指标对烟叶品质风格的影响
Effect of Climate Indices Based on Different Transplanting Date on Tobacco Quality and Style
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摘要: 为明确优质烟叶生产气候指标,探索浓香型风格成因,通过调整移栽期,改变烟叶不同生育阶段气候配置,并评价了烟叶风格品质.结果表明,调整移栽期对各气候指标影响较大,以日均气温变化最突出;烟叶浓香型风格也随移栽期推迟减弱,表现出正甜香.根据最佳移栽期烟叶对光、温等气候条件的需要,最佳移栽在4月底至5月上旬,典型浓香型烟叶第7片叶、第13片叶、第19片叶发育期间所需有效积温为900~1200 ℃/d左右,日平均温度为24.5~27.5 ℃,气温日较差为10.0~12.5 ℃,光照时数为135 h左右;伸根期、旺长期和成熟期分别需要日照时数在350、400和550 h左右,日均气温分别为21~23.5 ℃、26.6 ℃和27 ℃左右,气温日较差伸根期和旺长期13.0 ℃,成熟期9.0 ℃左右,有效积温伸根期350 ℃/d,旺长期550 ℃/d,成熟期900 ℃/d.Abstract: A field experiment was conducted to investigate climate conditions on tobacco quality and explore the reason of full aroma tobacco formation condition by adjusting the transplanting date and changing the climate configuration of different growing stages. The result showed that the effect of adjusting transplanting dates on climate indices was great, especially for daily mean temperature. The full aroma style decreased with later transplanting date and the formal sweet aroma enhanced. The best transplanting date was from the end of April to the first ten days of May based on the requirement of temperature and sunshine. About 900 to 1200 ℃/d effective accumulated temperature, 24.5 to 27.5 ℃ daily mean air temperature, 10.0 to 12.5 ℃ diurnal temperature and 135 h daylight hours were required for full aroma tobacco production. About 350 h daylight hours, 21 to 23.5 ℃ mean air temperature, 13.0 ℃ diurnal temperature and 350 ℃/d effective accumulated temperature were necessary for completing root extending stage; about 400h daylight hours, 26.6 ℃ mean air temperature, 13.0 ℃ diurnal temperature and 550 ℃/d effective accumulated temperature were needed for completing vigorous growth stage; about 550 h daylight hours, 27 ℃ mean air temperature, 9.0 ℃ diurnal temperature and 900 ℃/d effective accumulated temperature were necessary for completing maturing stage.